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Interesting use of ARG. Very light, too.

IBM Press Room - To better understand the dynamic behavior of cities, the City of Portland and IBM (NYSE: IBM) have collaborated to develop an interactive model of the relationships that exist among the city's core systems, including the economy, housing, education, public safety, transportation, healthcare/wellness, government services and utilities.

How is it?

I wish I knew -- I don't have an iPad. Looks like there's a fair bit of text entry, though; in the demo clip there's definitely an external keyboard of some kind in use. I would think that would make it pretty hard to have much fine-grained control without such a device. Still, I'd like to try it. Maybe my institution will foot for an iPad...if they do, I'll let you know. :)